The IETF workgroup responsible for the design of DHCP. Here you can find the charter of the group, its plans, and a most comprehensive list of Internet drafts and RFCs. http://www.ietf.org/html.charters/dhc-charter.html
A site about the most important book in the DHCP world today. By Ted Lemon - ISC DHCP leading developer; and Ralph E. Droms - DHC workgroup chairman (1'st ed - Pearson Higher Education; 2'ed ed - Sams - march 22, 2002). Covers just about everything you wa http://www.dhcp-handbook.com/
An important book for DHCP system administrators by Oscar Cepeda et. al (IBM Redbooks). There is also a downloadable version. It explains the DHCP protocol, how to install and manage DHCP on both servers, clients and mobile clients. Also have a short revi http://www.redbooks.ibm.com/abstracts/sg245280.html
A document attempting to answer basic questions on how to set up a Linux box to serve as a DHCP server or a DHCP client. http://en.tldp.org/HOWTO/DHCP/